Influence of Retained Austenite, Strain-induced Martensite and Bending Stress upon Shot Peening-induced Residual Compressive

Author:  Ando, Eto, Matsui
Source:  Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany
Doc ID:  2002027
Year of Publication:  2002
Authors Kotoji Ando 1), Hirohito Eto 2) and Katsuyuki Matsui 2) 1) Yokohama National University, Yokohama, Japan, 2) Isuzu Motors LTD, Kawasaki, Japan Abstract To introduce large residaul compressive stresses by means of shot peening, the authors conducted an experiment using vacuum carburized and shot peened or stress peened test pieces. The influence of arc height (Ah), shot radius (R), retained austenite (yR), strain-induced martensite (MQ) and bending stress (Qpre) upon residual compressive stresses was investigated systematically. Residaul compressive stresses were found to be quite dependent on Ah/R, only slightly influenced by yR and hardly affected by MQ content. Approximately, 50% of the applied Qpre was introduced as residual compressive stress. Finally, the amount of induced residual compressive stresses linearly depended on An/R, yR and Qpre.

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